Modifications in Roots of Zea mays Seedlings Induced by X-Irradiation of Dry Seed

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Abstract
Exposure of dry Z mays seeds to X-rays produced modifications in the roots of growing seedlings examined at three days of growth. X- irradiation inhibited cell division in the root tips but apparently had no effect on cell expansion. Therefore, seedling growth from X-irradiated seed is due primarily to expansion of cells pre-existing in the embryo. Roots grown from X-irradiated seed were thicker and had more cells per cross section than roots from unirradiated seed. On the average, X-irradiation had little effect on the cell cross section. Roots grown from X-irradiated seed had fewer cells in the root apex, whereas the cell length was doubled.

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